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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities
The following table sets forth the Company’s marketable securities for the indicated period:

   
December 31,
  
   
2019
    
2020
  
Level 2 securities:
      
U.S government and agency bonds
  
$
2,499
    
$
4,192
  
Canada government bonds
    
999
      
-
  
Other foreign government bonds
    
3,521
      
2,006
  
Corporate bonds*
    
33,947
      
15,454
  
Total
  
$
40,966
    
$
21,652
  

* Investments in Corporate bonds rated A or higher.
Summary of Changes in Fair Value of Marketable Securities
The table below sets forth a summary of the changes in the fair value of the Company’s marketable securities for the years ended December 31, 2019 and 2020:

   
December 31,
  
   
2019
    
2020
  
Balance at beginning of the year
  
$
56,662
    
$
40,966
  
Additions
    
38,702
      
32,322
  
Sale or maturity
    
(54,333
)
    
(51,498
)
Changes in fair value during the year
    
(65
)
    
(138
)
Balance at end of the year
  
$
40,966
    
$
21,652
  
Schedule of Debt Securities
As of December 31, 2020, the Company’s debt securities had the following maturity dates:

   
Market value
  
   
December 31,
  
   
2020
  
Due within one year
    
21,652
  
1 to 2 years
    
-
  
Total
    
21,652